Variable resolution seamless tileable display

ABSTRACT

A tileable display panel includes an illumination layer, a display layer, and a screen layer. The display layer is disposed between the screen layer and the lamp layer and includes pixelets. Each of the pixelets is positioned to be illuminated by lamp light from the illumination layer and to project a magnified image sub-portion onto the screen layer such that the magnified image sub-portions collectively blend together to form a unified image on the screen layer. Each of the pixelets includes core pixels and peripheral pixels surrounding the core pixels on one or more sides which provide a higher image resolution in overlap regions on the screen layer when the magnified image sub-portions overlap on the screen layer.

The present application is a continuation of U.S. application Ser. No.14/047,741 filed on Oct. 7, 2013.

TECHNICAL FIELD

This disclosure relates generally to optical displays, and in particularbut not exclusively, relates to seamless tiling of optical displays.

BACKGROUND INFORMATION

Large wall displays can be prohibitively expensive as the cost tomanufacture display panels rises exponentially with monolithic displayarea. This exponential rise in cost arises from the increased complexityof large monolithic displays, the decrease in yields associated withlarge displays (a greater number of components must be defect free forlarge displays), and increased shipping, delivery, and setup costs.Tiling smaller display panels to form larger multi-panel displays canhelp reduce many of the costs associated with large monolithic displays.

FIGS. 1A and 1B illustrate how tiling multiple smaller, less expensivedisplay panels 100 together can achieve a large multi-panel display 105,which may be used as a large wall display. The individual imagesdisplayed by each display panel 100 may constitute a sub-portion of thelarger overall composite image collectively displayed by multi-paneldisplay 105. While multi-panel display 105 can reduce costs, visually ithas a major drawback. Each display panel 100, includes a bezel 110around its periphery. Bezel 110 is a mechanical structure that housespixel region 115 in which the display pixels are disposed. In recentyears, manufactures have reduced the thickness of bezel 110 considerablyto less than 2 mm. However, even these thin bezel trims are still verynoticeable to the naked eye, distract the viewer, and otherwise detractfrom the overall visual experience.

BRIEF DESCRIPTION OF THE DRAWINGS

Non-limiting and non-exhaustive embodiments of the invention aredescribed with reference to the following figures, wherein likereference numerals refer to like parts throughout the various viewsunless otherwise specified. The drawings are not necessarily to scale,emphasis instead being placed upon illustrating the principles beingdescribed.

FIGS. 1A & 1B illustrate conventional display panel tiling.

FIGS. 2A and 2B are perspective views illustrating functional layers ofa tileable display panel, in accordance with an embodiment of thedisclosure.

FIG. 3A is a cross-sectional view of functional layers of a tileabledisplay panel illustrating overlap regions in a projected unified image,in accordance with an embodiment of the disclosure.

FIG. 3B is a plan view of two tileable display panels illustrating howoverlap regions conceal interior and exterior seams, in accordance withan embodiment of the disclosure.

FIG. 4A is a plan view of a display layer of a tileable display panelillustrating how transmissive apertures of peripheral pixels in apixelet are smaller than core pixels in the pixelet, in accordance withan embodiment of the disclosure.

FIG. 4B illustrates how the peripheral pixels of adjacent pixeletsproduce pixel images on the screen layer that combine in the overlapregion to increase the image resolution in the overlap region, inaccordance with an embodiment of the disclosure.

FIG. 5A is a plan view of a display layer of a tileable display panelillustrating how peripheral pixels in a pixelet are smaller with areduced separation pitch than core pixels in the pixelet, in accordancewith an embodiment of the disclosure.

FIG. 5B illustrates how the peripheral pixels of adjacent pixeletsproduce pixel images on the screen layer that combine in the overlapregion to increase the image resolution in the overlap region, inaccordance with an embodiment of the disclosure.

FIGS. 6A & 6B illustrate how blurring pixel images projected byperipheral pixels into the overlap regions on the screen layer reducesthe perception of seams in the unified image on the screen layer, inaccordance with embodiments of the disclosure.

DETAILED DESCRIPTION

Embodiments of a system, apparatus, and techniques for a seamlesstileable display panel are described herein. In the followingdescription numerous specific details are set forth to provide athorough understanding of the embodiments. One skilled in the relevantart will recognize, however, that the techniques described herein can bepracticed without one or more of the specific details, or with othermethods, components, materials, etc. In other instances, well-knownstructures, materials, or operations are not shown or described indetail to avoid obscuring certain aspects.

Reference throughout this specification to “one embodiment” or “anembodiment” means that a particular feature, structure, orcharacteristic described in connection with the embodiment is includedin at least one embodiment of the present invention. Thus, theappearances of the phrases “in one embodiment” or “in an embodiment” invarious places throughout this specification are not necessarily allreferring to the same embodiment. Furthermore, the particular features,structures, or characteristics may be combined in any suitable manner inone or more embodiments.

FIGS. 2A and 2B are perspective views illustrating functional layers ofa tileable display panel 200, in accordance with an embodiment of thedisclosure. The illustrated embodiment of tileable display panel 200includes an illumination layer 205, a display layer 210, and a screenlayer 215. Referring to FIG. 2B, the illustrated embodiment ofillumination layer 205 includes an array of lamps 220 and anillumination controller 225. The illustrated embodiment of display layer210 includes pixelets 230 separated from each other by spacing regions235 and a display controller 240.

In the illustrated embodiment, each lamp 220 is aligned under acorresponding pixelet 230 to illuminate a backside of the correspondingpixelet with lamp light. Lamps 220 may be implemented as independentlight sources (e.g., color or monochromatic LEDs, quantum dots, etc.)that emit light with a defined angular spread or cone to fullyilluminate their corresponding pixelet 230 residing above on displaylayer 210. The illumination layer 205 and display layer 210 areseparated from each other by a fixed distance 245 (e.g., 8 mm). Thisseparation may be achieved using a transparent intermediary (e.g., glassor plastic layers) and may further include one or more optical elements(e.g., lenses, apertures, beam confiners, etc.) to control or manipulatethe angular extent and cross-sectional shape of the lamp light emittedfrom lamps 220. In one embodiment, illumination controller 225 iscoupled to lamps 220 to control their illumination intensity.

Pixelets 230 are disposed on the display layer 210 and each includes anarray of transmissive pixels (e.g., 100 pixels by 100 pixels). In oneembodiment, the transmissive pixels may be implemented as backlit liquidcrystal pixels. Each pixelet 230 is an independent display array that isseparated from adjacent pixelets 230 by spacing regions 235 on displaylayer 210. The internal spacing regions 235 that separate adjacentpixelets 230 from each other may be twice the width as the perimeterspacing regions 235 that separate a given pixelet 230 from an outer edgeof display layer 210. In one embodiment, the internal spacing regions235 have a width of 4 mm while the perimeter spacing regions 235 have awidth of 2 mm. Of course, other dimensions may be implemented.

Although FIGS. 2A and 2B illustrate each display layer 210 as includingsix pixelets 230 arranged into two rows and three columns, it should beappreciated that various implementations of tileable display panel 200may include more or less pixelets 230 organized into differingcombinations of rows and columns. As such, in embodiments having aone-to-one ratio of lamps 220 to pixelets 230, the number and layout oflamps 220 on illumination layer 205 may also vary. While FIGS. 2A and 2Bdo not illustrate intervening layers between the three illustratedlayers, it should be appreciated that embodiments may include variousintervening optical and structural layers, such as lens arrays,transparent substrates to provide mechanical rigidity and opticaloffsets, a protective layer over screen layer 215, or otherwise.

Pixelets 230 are switched under control of display controller 240 tomodulate the lamp light and project magnified image sub-portions 250onto a backside of screen layer 215. In one embodiment, screen layer 215is fabricated of a matte material suitable for rear projection that iscoated onto a transparent substrate that provides mechanical support.Magnified image sub-portions 250 collectively blend together on screenlayer 215 to present a unified image to a viewer from the viewing sideof screen layer 215 that is substantially without seams. In other words,the images created by pixelets 230 are magnified as they are projectedacross separation 255 (e.g., 2 mm) between display layer 210 and screenlayer 215. The magnified image sub-portions 250 are magnified enough toextend over and cover spacing regions 235. The magnification factor isdependent upon separation 255 and the angular spread of the lamp lightemitted by lamps 220. In one embodiment, the magnified imagesub-portions are magnified by a factor of approximately 1.5. Not onlydoes the unified image cover the internal spacing regions 235, but alsocovers the perimeter spacing regions 235. As such, tileable displaypanel 200 may be positioned adjacent to other tileable display panels200 and communicatively interlinked to form larger composite seamlessdisplays, in which case the unified image generated by a single tileabledisplay panel becomes a sub-portion of a multi-panel unified image.

As illustrated, pixelets 230 are spaced across display layer 210 in amatrix with spacing regions 235 separating each pixelet 230. In oneembodiment, pixelets 230 each represent a separate and independent arrayof display pixels (e.g., backlit LCD pixels). Spacing region 235 aresignificantly larger than the inter-pixel separation between pixels of agiven pixelet 230. Spacing regions 235 provide improved flexibility forrouting signal lines or the inclusion of additional circuitry, such asdisplay controller 240. Spacing regions 235 that reside along theexterior perimeter of display layer 210 also provide space for the bezeltrim of tileable display panel 200. The bezel trim operates as the sidesof the housing for tileable display panel 200. The spacing regions 235that reside along the exterior perimeter also provide space for powerand/or communication ports.

While careful control over manufacturing tolerances can provide goodalignment between adjacent magnified image sub-portions 250 (intra panelseams), these seams may not be entirely invisible without significantmanufacturing expense. Furthermore, the external perimeter seams betweenadjacent magnified image sub-portions 250 on different tileable displaypanels 200 are greatly susceptible to user misalignments when mounting amulti-panel display on a surface and as such may be even more visible.Accordingly, techniques described herein use overlap regions havinghigher image resolution on screen layer 215 to overcome manufacturingand user misalignments and blend adjacent magnified image sub-portions250 in a manner that provides a near seamless unified image.

FIG. 3A is a cross-sectional view of the three functional layers oftileable display panel 200, in accordance with an embodiment of thedisclosure. As illustrated, the position and beam spread of lamp 220relative to pixelets 230 and screen layer 215 are designed such that thepixelets 230 project magnified image sub-portions 250 that overlap withthose of adjacent neighbors. These overlapping areas of magnified imagesub-portions 250 projected onto the backside of screen layer 215 arereferred to as overlap regions 305.

Overlap regions 305 may be several pixels wide and provide a region onscreen layer 215 where adjacent pixelets 230 both contribute imagepixels onto screen layer 215. Since both adjacent pixelets 230contribute image pixels into overlap regions 305, these regions havehigher effective image resolution, which provides greater flexibilityfor blending adjacent magnified image sub-portions 250 in a nearseamless manner. The overlapping image pixels and higher imageresolution provides greater flexibility to seamlessly combine magnifiedimage sub-portions 250. In one embodiment, the higher image resolutionin overlap regions 305 facilitates intelligent mapping of content toselected physical pixels along both interior seams 251 and exteriorseams 252. Intelligent mapping of content can be used to applyconfigurable alignment to adjacent magnified image sub-portions 250.Configurable alignment may include both linear and non-lineartranslations of the magnified image sub-portions 250. In one embodiment,image distortions (e.g., blurring) may be applied in overlap regions 305to help conceal the appearance of seam lines. The higher imageresolution permits the image distortion to be applied in a moreeffective manner while reducing the perception of this distortion.

FIG. 3B is a plan view of two tileable display panels 200 illustratinghow overlap regions 305 conceal interior and exterior seams, inaccordance with an embodiment of the disclosure. As illustrated,magnified image sub-portions 205 overlap along both interior seams 251(see FIG. 2B) running above interior perimeter sides 310 (see FIG. 3B)of pixelets 230 and exterior seams 252 (see FIG. 2B) running aboveexterior perimeter sides 315 (see FIG. 3B) of pixelets 230.

FIG. 4A is a plan view of a pixelet on a display layer of a tileabledisplay panel illustrating how transmissive apertures of peripheralpixels in the pixelet are smaller than core pixels, in accordance withan embodiment of the disclosure. Pixelet 400 is one possibleimplementation of pixelets 230 illustrated in FIG. 2B. The illustratedembodiment of pixelet 400 includes core pixels 405 and peripheral pixels410.

Although FIG. 4A illustrates a 16×16 pixel array, in practice pixelet400 will typically be much larger (e.g., 100×100 pixel array, 200×200pixel array, or otherwise). Peripheral pixels 410 surround core pixels405 on two or more sides (FIG. 4A illustrates peripheral pixels 410surrounding on all four sides). In various embodiments, peripheralpixels 410 may typically range between three and ten pixels deep aroundthe perimeter of pixelet 400; however, other embodiments may beimplemented with the peripheral region being two pixels deep or greaterthan ten pixels deep.

Both core pixels 405 and peripheral pixels 410 are implemented astransmissive backlit display pixels, such as LCD pixels; however,peripheral pixels 410 are different than core pixels 405. Each pixelincludes a transmissive aperture, illustrated symbolically as the greyedout portion of each pixel in FIG. 4A. The transmissive apertures are theportion of each pixel that selectively transmits or blocks light inresponse to a control signal for the given pixel. As illustrated in FIG.4A, core pixels 405 and peripheral pixels 410 both share a commonseparation pitch, as measured center-to-center between adjacent pixels.However, the size (e.g., area) of the transmissive aperture ofperipheral pixels 410 is smaller than the size of the transmissiveaperture of core pixels 405. In one embodiment, the transmissiveaperture size of peripheral pixels 405 is half the area of thetransmissive aperture size of core pixels 410. Other size ratios may beimplemented. Although not illustrated, in some embodiments, theseparation pitch of peripheral pixels 410 may also be smaller than thatof core pixels 405. In yet another embodiment, one or both of thetransmissive aperture size and/or the separation pitch of peripheralpixels 410 may be non-uniform and gradually decrease with proximitytowards the perimeter edge of pixelet 400.

FIG. 4B illustrates how the peripheral pixels of adjacent pixeletsproduce pixel images 420 on the screen layer that combine in overlapregion 425 to increase the image resolution in overlap region 425, inaccordance with an embodiment of the disclosure. As illustrated, byusing appropriate alignments and offsets between adjacent pixelets onthe display layer, the images projected onto the backside of the screenlayer in overlap region 425 have increased image resolution. In theexample of maintaining a constant separation pitch between core andperipheral pixels while halving the size of each transmissive aperture,the image resolution is doubled in overlap region 425, while the imagebrightness remains effectively constant since the overall ratio oftransmissive to non-transmissive area in overlap region 425 to the coreregion remains constant. Overlap region 425 can be used to blend bothintra and inter panel seams.

FIG. 5A is a plan view of a pixelet 500 of a tileable display panelillustrating how peripheral pixels in a pixelet are smaller with areduced separation pitch than core pixels in the pixelet, in accordancewith an embodiment of the disclosure. Pixelet 500 is one possibleimplementation of pixelets 230 illustrated in FIG. 2B. The illustratedembodiment of pixelet 500 includes core pixels 505 and peripheral pixels510.

Although FIG. 5A illustrates a 13×13 pixel array, in practice pixelet500 will typically be much larger (e.g., 100×100 pixel array).Peripheral pixels 510 surround core pixels 505 on two or more sides(FIG. 5A illustrates peripheral pixels 510 surrounding on all foursides). In various embodiments, peripheral pixels 510 may typicallyrange between three and five pixels deep around the perimeter of pixelet500; however, other embodiments may be implemented with the peripheralregion being two pixels deep or greater than five pixels deep.

Both core pixels 505 and peripheral pixels 510 are implemented astransmissive backlit display pixels, such as LCD pixels; however, theperipheral pixels 510 are different than core pixels 505. As illustratedin FIG. 5A, peripheral pixels 510 are smaller in size and have a smallerseparation pitch than core pixels 505. In one embodiment, the peripheralpixels 510 are half the size of core pixels 505 and have half theseparation pitch. Of course, other size and pitch ratios may beimplemented. In other embodiments (not illustrated), one or both of thepixel size and/or the separation pitch of peripheral pixels 510 may benon-uniform and gradually decrease with proximity towards the perimeteredge of pixelet 500.

FIG. 5B illustrates how the peripheral pixels of adjacent pixeletsproduce pixel images 515 on the screen layer that combine in overlapregion 520 to increase the image resolution in overlap region 520relative to the core pixel region, in accordance with an embodiment ofthe disclosure. As illustrated, by using appropriate alignments andoffsets between adjacent pixelets on the display layer, the imagesprojected onto the backside of the screen layer in overlap region 520have increased image resolution. In the example of halving the pixelsize and separation pitch for peripheral pixels 510, the imageresolution may be quadrupled in overlap region 520. In one embodiment, adensity of peripheral pixels 510 is selected such that the lamp lighttransmitted to the backside of the screen layer in overlap region 520through peripheral pixels 510 has substantially uniform brightness tothe lamp light transmitted to the back side of the screen layer in coreregions of the screen layer through the core pixels 505. Overlap region520 can be used to blend both intra and inter panel seams.

The embodiment of FIG. 5A, while providing a greater increase in imageresolution relative to the embodiment of FIG. 4A, may be more expensiveto fabricate than the embodiment of FIG. 4A. Accordingly, in oneembodiment, both seaming techniques may be implemented together. Forexample, the technique of FIG. 4A (constant separation pitch withreduced transmission aperture sizes) is used along interior perimetersides 310 to hide intra-panel seams between adjacent pixelets 230, whilethe technique of FIG. 5A (reduced pixel size and reduced separationpitch) is used along exterior perimeter sides 315 to hide inter-panelseams between adjacent pixelets 230 of different tileable display panels200.

In some embodiments, pixelets 230 may be bundled into modules or groupsto ease manufacturing by reducing the number of display pixels andpixelets manufactured on a monolithic substrate. For example, ademonstrative tileable display panel 200 may include a total of 400pixelets 230 on display layer 210; however, in one embodiment, these 400pixelets 230 may be fabricated in modules or groups of 20, with 20 suchmodules brought together during assembly to form a single display layer210. As such, these modules also include interior and exterior seams,which may benefit from greater image resolution along the moduleexterior seams compared to the module interior seams. Accordingly,various embodiments design the peripheral pixels of different pixelets230 on display layer 210 to provide variable increases in the imageresolution in the overlap regions 305 across screen layer 215 to correctfor alignment or artifacts present at the various boundaries.

FIGS. 6A & 6B illustrate how blurring pixel images projected byperipheral pixels into the overlap regions 605 on the screen layerreduces the perception of seams in the unified image on the screenlayer, in accordance with embodiments of the disclosure. As mentionedabove, the overlapping of image pixels and the resultant higher imageresolution provides greater flexibility to seamlessly combine magnifiedimage sub-portions 250 using software manipulations of the images alongjust the seams. One such manipulation is to blur the pixels images injust overlap regions 605. Blurring the images makes regular patterns,such as a straight line seam, less noticeable to the human eye. However,the higher image resolution in overlap regions 605 make the imageblurring less noticeable when compared to the image portion projectedfrom the core pixels. Accordingly, in some embodiments, displaycontroller 240 operates to reduce image sharpness just around theperimeters of pixelets 230 relative to the core region of pixelets 230.Other image manipulations techniques (e.g., remapping physical pixelsand image content) may be implemented and the high resolution providedby the peripheral pixels in overlap regions 605 provides greaterflexibility to do so, without increasing the pixel resolution of theentire display layer 210, which increases computational complexity andfabrication costs.

The above description of illustrated embodiments of the invention,including what is described in the Abstract, is not intended to beexhaustive or to limit the invention to the precise forms disclosed.While specific embodiments of, and examples for, the invention aredescribed herein for illustrative purposes, various modifications arepossible within the scope of the invention, as those skilled in therelevant art will recognize.

These modifications can be made to the invention in light of the abovedetailed description. The terms used in the following claims should notbe construed to limit the invention to the specific embodimentsdisclosed in the specification. Rather, the scope of the invention is tobe determined entirely by the following claims, which are to beconstrued in accordance with established doctrines of claiminterpretation.

What is claimed is:
 1. A tileable display panel, comprising: a screenlayer upon which a unified image is projected; an illumination layer togenerate lamp light; and a display layer disposed between the screenlayer and the lamp layer, the display layer including a plurality ofpixelets, wherein each of the pixelets is positioned to be illuminatedby the lamp light from the illumination layer and to project a magnifiedimage sub-portion onto the screen layer such that the magnified imagesub-portions collectively blend together to form the unified image,wherein each of the pixelets includes an array of transmissive pixelscomprising: core pixels; and peripheral pixels disposed on one or moresides of the core pixels which provide a higher image resolution inoverlap regions on the screen layer when the magnified imagesub-portions projected from adjacent pixelets overlap on the screenlayer.
 2. The tileable display panel of claim 1, wherein each of theperipheral pixels has a transmissive aperture that is smaller in areathan that of the core pixels.
 3. The tileable display panel of claim 2,wherein the peripheral pixels have a constant separation pitch that isequivalent to a first separation pitch of the core pixels.
 4. Thetileable display panel of claim 2, wherein a size of the transmissiveapertures of the peripheral pixels is selected such that the lamp lighttransmitted to the screen layer in the overlap regions through theperipheral pixels has substantially uniform brightness to the lamp lighttransmitted to the screen layer in core regions of the screen layerthrough the core pixels.
 5. The tileable display panel of claim 1,wherein the peripheral pixels are smaller than the core pixels and havea second separation pitch that is shorter than a first separation pitchof the core pixels.
 6. The tileable display panel of claim 5, wherein adensity of the peripheral pixels is selected such that the lamp lighttransmitted to the screen layer in the overlap regions through theperipheral pixels has substantially uniform brightness to the lamp lighttransmitted to the back side of the screen layer in core regions of thescreen layer through the core pixels.
 7. The tileable display panel ofclaim 1, wherein the peripheral pixels extend between three to tenpixels deep around a perimeter of each of the pixelets.
 8. The tileabledisplay panel of claim 1, wherein the peripheral pixels that areadjacent to exterior perimeter sides of the tileable display panel havesmaller separation pitch, transmissive aperture, or pixel size than theperipheral pixels that are adjacent to interior perimeter sides of thepixelets to provide increased blending across adjacent tileable displaypanels relative to adjacent pixelets within the tileable display panel.9. The tileable display panel of claim 1, wherein the peripheral pixelsof different pixelets on the display layer provide variable increases inthe image resolution in the overlap regions across the screen layer. 10.The tileable display panel of claim 1, wherein the peripheral pixelsthat are adjacent to exterior perimeter sides of the tileable displaypanel have a smaller separation pitch than the core pixels while theperipheral pixels that are adjacent to interior perimeter sides of thepixelets have a smaller transmissive aperture than the core pixels. 11.The tileable display panel of claim 1, further comprising: a displaycontroller coupled to the core and peripheral pixels to reduce imagesharpness of the peripheral pixels relative to the core pixels to reducethe appearance of a seam in the overlap regions.
 12. The tileabledisplay panel of claim 1, wherein one or both of a separation pitch ortransmissive aperture size of the peripheral pixels is non-uniform anddecreases with closer proximity to a perimeter of a given pixelet.
 13. Adisplay system, comprising: a plurality of display panels each housedwithin a bezel that permits the display panels to be aligned relative toeach other and communicatively coupled to collectively display amulti-panel unified image across the display panels, wherein each of thedisplay panels includes: a screen layer; an illumination layer togenerate lamp light; and a display layer disposed between the screenlayer and the lamp layer, the display layer including a plurality ofpixelets, wherein each of the pixelets is positioned to be illuminatedby the lamp light from the illumination layer and to project a magnifiedimage sub-portion onto the screen layer such that the magnified imagesub-portions of all the display panels collectively blend together toform the multi-panel unified image which covers the bezels separatingadjacent display panels, wherein each of the pixelets includes an arrayof transmissive pixels comprising: core pixels each having a commonsize; and peripheral pixels adjacent to the core pixels on one or moresides of the core pixels which provide a higher image resolution inoverlap regions on the screen layer when the magnified imagesub-portions projected from adjacent pixelets overlap on the screenlayer.
 14. The display system of claim 13, wherein each of theperipheral pixels has a transmissive aperture that is smaller in areathan that of the core pixels.
 15. The display system of claim 14,wherein the peripheral pixels have a constant separation pitch that isequivalent to a first separation pitch of the core pixels.
 16. Thedisplay system of claim 14, wherein a size of the transmissive aperturesof the peripheral pixels is selected such that the lamp lighttransmitted to the screen layer in the overlap regions through theperipheral pixels has substantially uniform brightness to the lamp lighttransmitted to the screen layer in core regions of the screen layerthrough the core pixels.
 17. The display system of claim 13, wherein theperipheral pixels are smaller than the core pixels and have a secondseparation pitch that is shorter than a first separation pitch of thecore pixels.
 18. The display system of claim 17, wherein a density ofthe peripheral pixels is selected such that the lamp light transmittedto the screen layer in the overlap regions through the peripheral pixelsof adjacent pixelets has substantially uniform brightness to the lamplight transmitted to the back side of the screen layer in core regionsof the screen layer through the core pixels.
 19. The display system ofclaim 13, wherein the peripheral pixels that are adjacent to exteriorperimeter sides of a given display panel have a smaller separation pitchthan the core pixels while the peripheral pixels that are adjacent tointerior perimeter sides of the pixelets have a smaller transmissiveaperture than the core pixels.
 20. The display system of claim 13,further comprising: a display controller coupled to the core andperipheral pixels to reduce image sharpness of the peripheral pixelsrelative to the core pixels to reduce the appearance of a seam in theoverlap regions.